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50 lines
1.9 KiB
Plaintext
50 lines
1.9 KiB
Plaintext
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/* BBC Micro Header File for C02 Standard Library */
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/* This header contains standardized Constants, *
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* Variables, and Function Calls tailored to a *
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* a specific platform. */
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/* System Specific ASCII Key Codes */
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#define DELKEY $7F //Delete/Backspace Key
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#define ESCKEY $1B //Escape/Stop Key
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#define RTNKEY $0D //Return/Enter Key
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#define NULKEY $00 //No Key was Pressed
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/* Zero Page Variables used as Pointers */
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zeropage int srcptr, dstptr, bfrptr, blkptr;
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char bfrlo,bfrhi; //Buffer Pointer for Library Functions
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char stklo,stkhi; //Stack Pointer
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/* Ephemeral Library Variables *
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* Available for use in program code, but may *
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* be obliterated by Function Calls. *
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* May be Zero Page, but not required */
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char temp0,temp1,temp2,temp3; //Temporary variables
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/* Static Library Variables *
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* Must be preserved between function calls *
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* May be Zero Page, but not required */
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int blkbgn, blkend; //Block Start and End Address
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char blklen; //Block Segment Length
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char stkslo, stkshi; //Stack Start Address
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char stkelo, stkehi; //Stsck End Address
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char random; //Last Result of Pseudo-Random Number Generator
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char rdseed; //System Seed for Pseudo-Random Number Generator
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//System Subroutines
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void delchr(); //Delete previous character
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char getkey(); //Read ASCII character from Console
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char getpos(); //Get Cursor Position
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char getsiz(); //Get Screen Size
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void newlin(); //Advance cursor to beginning of next line
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char polkey(); //Poll Console for character
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char putchr(); //Print ASCII character to Console
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void prbyte(); //Print Accumulator as Hexadadecimal number
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void prhex(); //Print Low Nybble of Accumulator as Hex Digit
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char getchr(); //Wait for character from Console
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void setpos(); //Set Cursor Position
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//System Labels
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start: //Start of Code
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exit: //Return to Operating System
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